Headphone



FIG. 1 is a front view showing my new design;

FIG. 2 is a right-side view thereof;

FIG. 3 is a left-side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view.

The ornamental design for a headphone, as shown and described.